Prevent automatic String to Integer conversion in Jackson

Question

I have a simple POJO:

public class ADate {
    private Integer day;
    private Integer month;
    private Integer year;
    ... // getters/setters/construct         


        

Answer 1

I've found the some interesting code on Jackson github issues. Changed it a little and that's what I got:

public class ForceIntegerDeserializer extends JsonDeserializer {

    @Override
    public int deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        if (jsonParser.getCurrentToken() != JsonToken.VALUE_NUMBER_INT) {
            throw deserializationContext.wrongTokenException(jsonParser, JsonToken.VALUE_STRING, "Attempted to parse String to int but this is forbidden");
        }
        return jsonParser.getValueAsInt();
    }
}